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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e714227e2a69d0f847f6e95f240599b2ad46b1f3d30dbc401cc170b1cc8399af' 
  AND token = 'ppWXvlVFf852erbK5IQDVodhKnPZAa5DMN4mlkUr7aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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