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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb972035a75171f27e7fd2b4b254c99273d7dd5a2a345c9b5df9dd77b21b9000' 
  AND token = 'Ec5mU4omSDwWXpP6DF7qezcbYTOSfJgAoL7/y8Q59ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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