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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af63de862c98e53f5c93c06bb8ebb26fd331d01ca280f83ca0d08643c5b19b12' 
  AND token = 'tjkC6IuIWmKBJU5xheT3TeCumtX9+DBh/gFec+dFaqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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