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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034ba40cd7a28b692d0583d31e6111947072d038a18caf342e0be1189fe15224' 
  AND token = 'HH1meZLOUPOUGg6Jldu8Dt27cvL0VwdYcVmlFuOL7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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