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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bfe01ed483dca9d554bf91e5e63c893a3a895758a5d6189aa87bf5ab22af1d' 
  AND token = 'Zo8Rdj+NOBuWeyQHWV81ebMfUu6rWJX4MnmNZ3eaZ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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