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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd150f0c05cda91b693c5dec3f034a5cb4670678aacd720fff884a933d4d6f2' 
  AND token = 'Lcjng7pm2d1FN8DQ8jCHUzYd2bgIhGpnb9G4pzjIwFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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