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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718cd204e967084a73947c2952eb68ac94e8f59a7f1870d9df05fcd696f899af' 
  AND token = '0VhZ/4dn4V6e3yCfeQZOSqeQ7sn5wP5c/N9sluVFj+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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