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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf3118b38e777ddc35694c53f114ae0a662132abdb2938c3b5b7a0a768cd471' 
  AND token = 'FJtexqSQTOkfAJYmQ5DtEfJWEP5H9wlAfz4OcLjXzUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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