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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bf828e7f677a52aae8eac99a854088b4c5c77536a18f68f667ae28c6a224a3' 
  AND token = 'Hv66pkkZ0RkVDuGlLLSRu6rMIjXjkntaOiyocrI0YhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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