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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f408dccf4baa4723c458cf4da4002d856d3c6d8e35beb4a028a3400eb4f038' 
  AND token = 'gFieP/j5MeLBHGWYJ9YgalO3oDQ9drHRz2XBuxi9+U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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