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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decea9f72927d430459eaf10c533b599e339a6db43a314a80d710d8236171886' 
  AND token = 'fEOodafwtWCm91wOkkTnye/FKlJkdbE8Hp4qk5k5JUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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