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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9cb255b3c02d0e04634cc6aef70dff049ccdfa061bc14726d8c9db0765c8aa' 
  AND token = 'Eqfp7i+w30hXOi37+yPQDjXMtgDMOXf1wozZc3JWK08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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