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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a768dbd2b949ebd6ab4bd8f08c1c0f86fb0c2a08500a4e76d1739b02709893' 
  AND token = '3MzTkOHAQT4hut5r8+0aMyuHYFc8nC17Op3wuKHh2RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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