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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a0af5fb7fc9c311f880b2e159e8dfb8ac4498056a417215a0b75e9fef3dd65' 
  AND token = 'qN+Jo12LW77oVSi3BTn1BuCIkvhx0vQZdxYt5tWWk2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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