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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297d0b5049b3914a6ccf4674f73462dc1e3f0355430d34ef6b5545b7c2e832ea' 
  AND token = 'm62IlkT4taFYuZSZcBB9AlsmVHDBmqJYxnEWjtkIUKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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