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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff742ba78a03fb361a34c3e8b8dbce33d4e3d93ea447ba76e3aabe9b7e05b5f' 
  AND token = '1XIFanxE0Jb9ZF20st4y6YH0Yo3Vd9OvqguQePn4xU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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