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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a2743b1284f538072a005f8aad4a14cef22f199ee8be8527941a576d6250c1' 
  AND token = 'N6Ig8Es5C0rOdVdbIUt1pclb4JKF2mvrVg2zW3iYxbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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