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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da19505e30fa94e29ac53eb13a434d0bc057682c99b402f978e4a5be4e762635' 
  AND token = 'UivWdRu9q7EtSqWRuQAI5WVuE1Z0RmdeFr/RTMfVkmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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