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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae03be98c053045659b66c23b8be543c2047af2d15320424590d18ad3c385ec8' 
  AND token = 'g73dI/q3hT4B6cvYA1ZqBotsZi6ruH4B9vVDRFfVThE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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