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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1a09974748985892be8bc41615a7ea4898bd526175a924d4d89f4c537c86ea' 
  AND token = '9O05MmPrq+6+lA3ciPeUzW+YnwGyomijj2N243uDpS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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