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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c3046ff8901b272675f36ba4bc97950bb98624a7bf1b5dab9115b40b8d2973' 
  AND token = 'zPOre2J+597mIe1NbB+X++V3qfBxnIkpd6DyMsmNB7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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