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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7714092294b99873d018ad3b85b28dad158b25403366c5ef0a9479933efea25' 
  AND token = '5sr/iaNIFS9J/ZYNdp5M2zJWcuTaA/8wph6QekM3MzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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