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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ec0420f1c0187975ed2275fe4680aa7e55a17d986ee045a7fd976e0cd3bb93' 
  AND token = 'ckWMqj0Qz2pAY6L8BrFvCpox2lLqH0jRekYeYMss63E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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