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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58180e68ae1065ea025f51be85aee184294bea690fd9961383ce290e38f19652' 
  AND token = '77ayJ7YReHn9oSc5zYm1sEVzQlN7ij7oius2CTTeegM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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