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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f0dbe2c1194dfc3268f71ed38d75a8a88cd8c9c0991d1f186f79a9d6bfb180' 
  AND token = '9odPor+xnrBBbjCKBJZdb+Kkv32z9VagXaAt+9celHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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