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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22bb228e7e23fd93c6f3e9d75a8752bdccdeae7f8330dc0551c4964209bcc5f7' 
  AND token = 'jVHpNTqK7BAUc32Lgkxlwfg422WodKLo/hH4uwP+/aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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