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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4455f8ff4482d466c7eed86eff72b45c61ef45f755b4fa77653ed78aa892d098' 
  AND token = 'KFAR7teE0w4euFlTRq3V/RrcWrMCQOYVkc+WPQfZMPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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