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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0681718c25bb9488aa8f056cbbe589d5f965e5fc644df6dc4cc9b357e237b9d' 
  AND token = 'MXg+9d9pukTWMrQTKT/s3D/04hFDL7zXZ6WZ4PIVcdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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