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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdcf559cc3d0b628e8b9a3d59d58e19f44dd584defd033e5961a7760eb53f50' 
  AND token = 'sqCRQFZrg6FIp8NmWwlMGnbNezPoRFfzzlKkREqPFkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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