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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3a231a8b08c9f32061f7e90281fe7c1b6f69ea390637bb3e592dada1893683' 
  AND token = 'menOW1aiGD+V07rnnRnflt4jh9hy7tHcDsDrcT+euos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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