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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4aef653cc24445b448b854853aa6213bd809e0d0c4acfbda758ae45e0ea313' 
  AND token = 'izW9FeC6lBWz4n9khKnKxI1Fspb9iWzX62q4xC6HDbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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