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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce59f07487374aefd9e2ab13961f7d0ff352df309c8813e730cd5024ffa95aab' 
  AND token = 'MVImlByA0Xw9mWIY8JHNiW1EKxiM2B2ikrTW6RRU02M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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