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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7255f8148f89905b9af13e71dae9e19f24c3d6cdb3d331ce794c5e2293d4a0f4' 
  AND token = 'cfKCC9siAY0L1KvQwJZXAudPOB3aE3XpGZWkTaN24Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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