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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7dbdf15e9827f42110a7a9d0e0b88cc24a04b611600ca4bffbba495a2d4970' 
  AND token = 'ncbRSCLwIDpqkSll0UUZHQOUqEEOeR2Bp9mMWsmI4z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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