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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ee04839e5d0093ad134f71a9ec5a2533169ec051d6ba75738bef74a3cdd341' 
  AND token = 'biCNVXrKq7S5eNrw6xB6wRYFvDK/t2QVpFxpnNNP9Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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