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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b664e9a6c5a7422d3499dcb3353dfba507e4cc3dd7e17a38b2573a6f15e815' 
  AND token = 'xHNJyC33O5OxoyTS0p+JIwanSyMVqobvJdpXoxt0LmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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