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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc3d5184db4828bef9c2a7b6f1d31d939ad0bc9a83a57d94c7a563bc2bf010e' 
  AND token = 'BV1lMDUPI7FT+S1PC4dtn9fdkwLTr/WnxobqZ7DkCyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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