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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258754e41ef72482d9f0f1fb214fa613068b94213905622348f9f2be884f68a7' 
  AND token = 'KQBYaFgXobjFxpT5aucCxAE0aNL+zZeb83eCL9w6LFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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