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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594139e341786bcc007d88e28e37fe09c9db6908b29ad9e8bd23795a400ae1b0' 
  AND token = '2QKoElxjYMc7aQOhc2sEBpeM/+fcn3dTiB7k7jtEuco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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