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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6379244a044694de3dd838ab5ad3fa3ceb370872611267924152ba0a318008ac' 
  AND token = 'o5d5jY0dXn6qQLF9+H1/dbbbhT2oxUlo7p3whF4EO/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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