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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ea13580bf1ea396114ad211684fa354752068f09032be0b091a4801bc8ed3d' 
  AND token = 'rzpfSJf2QVWVoSPDVNL9hlZnosqGVw0LCw8tR4cHe3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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