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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944e0dbb687d300d5ff660e95b96e5b6f011006dbe59f79539fd4b32d1808188' 
  AND token = 'uio52Bx8K/3bnAvWqAI9TFxJMMvP2n75FiI1tuEr77A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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