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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a603f6124921745694f3fe23d1f96f8aae162c0db650af02b25eb00fb54765' 
  AND token = 'rJ9f0ivg6CHgT5wbuMjb+YCwb7FBZTBtn7Tw0DwF+2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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