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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc285f1c8b6fd5c206d44a588fd53954c9056e0355ec953d178b646365f751d' 
  AND token = 'egcB4pNqvJp9nn1j4nOzhVZnF258+mffYEik9A4bQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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