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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236910afe2c570e7e4aeb34e22f2808c16a70d723e1d8463272761d8f3cd1f27' 
  AND token = 'rjTqSNRpnNq/AsXxKfSCpw2EFye6+rBvNQaSNLsp0PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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