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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595d2c97a41c3d50510b46f40b7b6c5252dc0d96a21fc0b2e5375314a45ec620' 
  AND token = '/PMR5kv6uxVESzzD0XdbEs2clmiODWM8kRkS6VlIPlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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