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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8a480fc484b5a702337eff9a2797c98bc2787f9ba14ae9f3442333c8846a84' 
  AND token = 'eoMqjx4oV92XFC3MqdYdvncx7t8Sfd2b5lxSrKLleYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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