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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9327f044404cc7461d8e3156a3e86d8f6ac4515d93a5d60638c2e66e77b9939c' 
  AND token = 'HF4Wxy6JnrFT3pRs3DBxoL4cUuBCplMHF0U/QdmJYdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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