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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ae435c974b05ecf239e0e0a9ff28fae2354a84e50eb5431aafc1091842caa1' 
  AND token = '3dRa6yh0eX7TpoCgqsLXdna/k+OQ+x0wIKGqqN96RVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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