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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1fc775c8ee2f33226f7461fc2266499363cc9e5efd74108c18157f29e7a253' 
  AND token = 'aJ3dN+PzgO1s6FR+KM0c2rGqiuIvq2UElA7PHNfCMaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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