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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197f10f9ec3bd23006cd0b7f04ba7861abc2e486b55a95dbcd6d0b7d9e3077c9' 
  AND token = 'QRxjDorAL4J6JTI7ykp2J2LSM0588sS8ioB3SQgAYA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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