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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8968e23ed9ee082da3ad45abbde50115526963e9b8efd66c68a965ceb1352f1b' 
  AND token = 'rdLUPJYN5i08KWMi3I4B8Abcmuba/w2bmitQu3lEnYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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