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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134aa8ba8e1f190b3bb2f0002b9ed1b2c4db1ab0ef5d57ed00a2a92b5a5f07e8' 
  AND token = 'MlSxZDLDcU1hCO31+BY23BvMKm8a+Jl2zccGzE5Kr0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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