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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec08b8204fca73488700ef26c55b76b4d200ed1fc9c07b8f10bc576c017163ad' 
  AND token = 'Y3pGA5XbzGL39uIyyR7AzTSOBMmk80TMnERPN4q1cn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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