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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709c62e8b386ae6e3f95a11dfaa4a352ee05008de806da789e6d4342390bda40' 
  AND token = 'beewfkkj2kctuZKgyIPvvmP3615I8ttWnGQSyF8R8jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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