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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cd7ddde151f699ce931e942c2764c58da4a58b7247a4286bb84ab09911d121' 
  AND token = 'kB5eq7kdc7dLJKeY2rhCBPPNQyeFxT1+9mlnAzLtdw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}