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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29702a11b72b2d2e62ea8c18b1536af724a3f85a1444ceb447d952f044baebcb' 
  AND token = '60vd8r+emoixyeE7pjUrOeO/EO0Vg8NWGu6a/feyX9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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